Fireproof-safe construction



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1,525,203 F; A. SCHMITZ FIREPROOF SAFE CONSTRUCTION Filed Nov. 18, 1922 9 Sheets-Sheet 9 v E E Patented F eb. 3, 1925.

UNITED STATES PATENT oFFlcE.

FRED A. SCHMITZ, 0F YOUNGSTOWN, OHIO, ASSIGNOR TO THE GENERAL FIREPROOF- ING COMPANY, OF YOUNGSTOWN, O'HIO, A CORPORATION 0F OHIO.

FIREPROOF-SAFE CONSTRUCTION.

Application led November 18, 1922. Serial N'o. 601,734.

To all whom it may concern.'

Be it known that I, FRED A. SCHMITZ, citizen of the United States, residing at Youngstown, in the count-y of Mahoning and State of Ohio, have invented certain new and useful Improvements in Fireproof- Safe Constructions, of which the following is a specification.

This invention relates to an improvement in fire-proof safes of the type used in offices and the like for preserving records, docu'- ments and other valuables from loss by lire.

A primary object of the invention is to. provide a safe that may be readily fabricated to meet the desired specifications without the necessity of carrying a large stock of safes of different storage and lire resisting capacities.

To that end the invention contemplates a `tire-proof safe construction comprising a fabricated metal framev consisting of parts thatmay bemade in quantities and kept in stock and then readily assembled in the proper order to provide a skeleton framework on and about which a plastic cementitious lire-proof material may be molded to provide wallsA of the desired thickness according, to the kind of safe desired, that is, according to its heat-resisting requirements. Y

It is well known that the rise of temperature within the storage compartment of a safe is in inverse ratio-to the mass of material constituting the walls, and therefore the thicker the walls the' greater the heat resistance. And, in order to readily meet specifications calling for thicker walls the present invention contemplates the use of a plurality of standardized parts which permit of readily assembling,A and tightly and neatly -interlitting to produce a safe of the desired wall thickness by repeating the use of certain of the molding sections forming thc door frame. y

Another object is to provide a construc-` tion wherein thetop, sides and bottom of thev interior insulation-unit are integral or cast in one piece, thereby providing in et'- fect an open tireproof shell, the back of which is made by a separate preformed panel or section fitting into a properly prepared seat atuthe rear of the shell, and the Joint formed at the 'seat being sealed by a fire resisting cement while the front of' the open shell is closed by swinging fire-proof doors. vention distinguishes from safes wherein the back is molded integral with the sides, top and bottom ot' the interior part or unit, and which do not afford the advantages o construction and assembly provided by a 'safe made in accordance with the present invention.

A further object is to provide a safe, which, when completed is prepared to Withstand high temperature and possesses great strength against cracking or breaking open in' event that it should be struck by a falling part of a burning building structure, or if the safe itself should fall from a height as a result of a tire.

In that connection the present 1n A still further object of thev invention is I to provide novel means for retarding' the transmission of heat by conductivity from the outside casing of the safe through the door frame to the inner part of .the safe, thereby materially augmenting the factor of safety.

With the above and other objects of the invention, which will more readily a pear `as the nature of the invention is hotter understood, the same consists in the novel construction, combination, and arrangement Lof parts, hereinafter more fully described,

illustrated and claimed.

A preferred and practical embodiment of the invention is shown in the accompanyingv drawings, in which:

Figure l is a perspective view of a completed safe.

Figure lEl is a view of the primary structural element used as the basis of construction for the door frame.-

Figure 2 is a horizontal sectional view taken on the line 2 2 of Figure l.

Figure 3 is a vertical' cross sectional view taken on the line 3 3 of Figure l.

Figure 4f is 'a vertical cross sectional ve\ taken at right angles to Figure 3.

Figure 5 is a perspective view of the fabricated metal frame prior to the `fire-proofl composition being molded thereon.

Figure G is a perspective View showing the fabricated frame having the fire-proof filling molded thereon and the pre-formed back section about to be inserted to the open shell.

Figure 7 is a detail perspective view of Vone of the jamb moldings used in the formation of the door frame.

Figure 8 is a detail perspective view, partly in section showing the manner in which the hinges are supported at the sides of the door frame.

Figure 9 is a detail perspective view partly in section illustrating a lower` corner of' the safe showing the caster mounting.

Figure 10 is` a horizontal cross sectional View illustrating a class of safe having thicker' side walls than the! safe illustrated in Figures l to 9 inclusive.

Figure l1 is a detail perspectivevview of the lower corner of the door frame of a safe constructed in accordance with the modification shown in Figure l0.

Figure 12 is a detail perspective View, partl in section showing theseam construction or permitting the escape of gases generatedy Withinv the shell of the safe' in case of fire.

Similar reference characters designate corresponding parts throughout the several figures of the drawings.

As previously indicated, it is one of the important features of the present invention to rovide a construction which may be rea ily fabricated to meet different specifications, thereby obviating the necessity of carr ing many different types of safes made up or use.

In order to meet the needs of users of safes of various classes and also to effect desirable economies from a manufacturing, as well as a commercial standpoint, it is proposed to rovide a construction which will permit o the making of safes of different classes designated by their wall thickness. That is to say, a safe which must have maximum fire resisting qualities, for example, may be` designated as a class A safe, the Walls thereof being of maximum thickness and the storage compartment being corres ondngly smaller while safes of another c ass, class B for example, will have thinner walls and consequently less heat resisting properties but a correspondingly larger interior storage capacity. Safes of other classes may also bemade but the types referred to will serve to illustrate the range of application of the invention to safes of different types or classes.

For the purpose of illustration, Figures l to 9 inclusive of the drawings illustrate a safe of the so-called class B or safe cabinet t pe which has relatively thin walls while igures 10 and 11 illustrate a safe of the class A type wherein the walls are of increased thickness and the interior storage compartment correspondingly reduced due to the use of additional interfitting mold-v ings which widen the frame of the door, as wil hereinafter more fully appear.

In building a safe of the type herein proiposed, the door frame Av is preferably the rst part constructed and assembled, and with this frame as a base from which. to work, a skeleton cage', B is provided, the same being open or unobstructed at the rear to receive the back section C, and also open at the front to receive the swlnging doors D.

The primary structural element E 'of the door frame A is preferably a rectangular frame of channel formation and includes the top and bottom frame .bars l-l and the side frame bars 2 2 whose corners are preferably mitered and welded as indicated at 3 thereby to provide in effect an integral rec- .tangular frame member which is extremely rigid and contributes materially to the strength of the front part of the safe and maintains the corner angles of' the door frame trueto insure proper fitting of the doors when they are closed.

The webs or bottom walls of the channel bars 1 and 2 are provided with a plurality .of openings or perforations 4 which permit of the cementitious insulating material constituting the insulation unit or shell of the safe, flowing therethrou h to fill the front part of the door frame as will presently appear andto also have the effect of providing additional resistance to the conductivity of heat thereby preventing any tendency of the frame to buckle or warp.

As will be observed more particularly from Figures 3 and 9 the top and bottom frame bars 1-1 have secured thereto in any suitable manner, as by-riveting or welding,

the head and sill forming members 5 and 6, both of which'are of duplicate formation and are reversed in their application to the top and bottom members to provide the head and sill of the main door frame A. The said head and sill forming members 5 and 6 are of channel formation and have the long flanges 5a and 6a thereof attached to the bars 1 1 while the short flanges 5b and 6* thereof are spaced from the perforated web portion of the main frame members as shown in Figure 3 and carry therewith the coupling strips 7 and 7* to which the stepped and recessed head andsill moldings 8 and 88L are attached. y.

It'will therefore be apparent that the top and bottom edges of the door frame A consists primarily of the duplicate head and sill forming members 5 and 6 which are attached to the channel bars 1-1 and carry therewith the head and sill moldings 8 and 8* which are duplicates of each other but reversed in their assembly on the head and sill members to provide the opposite ends of the door opening. As will be observed from Figure 3 thebottoms of the recesses of the moldings 8 and 8a are provided with elongated key. openings 9 which permitof the cementitious insulating material flowing into the space provided by the depth of the openllf) ings due to the thickness of the metal to thereby break up the continuity of metal in the door frame and consequently provide additional resistance to the conductivity of heat to the storage compartment or interior -ures referred to the outer flat face 11 of each molding has secured thereto by suitable fastenings 12 and spot Welds 13, one leaf 14 of the hinges Which carry the doors D. To provide for properly spacing the hinge molding with reference to the bars 2 and also afford'adequate anchorage for the fastenings 12, a suitable filler strip 15 is arranged between' the inner side of the portion 11 ofthe hinge molding and the outer flanges of the bars.

As previously explained the hinge moldings 10 constitute the opposite #vertical corners ofthe door frame, and are each of substantially flaring cross section thereby providing pockets which are in open communication With the*vl rear of the channel -bars 2 through the openings 4 While the inside Wings are of angular' formation and provide a stepped door seatwhich includes the obliquely disposed face 16, shoulder 17, recess 18 and attaching flange19; and the outer Wing thereof, which includes the hinge attaching face 11,- terminates in an inset keeper flange 20, the purpose of which will hereinafter more fully appear.

The attaching flanges 1 9 of the hingeor corner moldings 10 .are `ladapted to have secured thereto the standardized j amb moldings 21, which are shownassembled on the hinge moldings in Figures 2, 5 and 6, and are illustrated more in detail in Figure 7. From this figure it will be observed that these moldings are formed to provide the flat door receiving faces 22 and 23 having therebetween the recess 24 the bottom Wall 25 therebetween being provided with elongated perforations 26 to receive' the cementitous insulating material in the same manner as the openings 9 of thehead and sill moldings 8 and 8a. The flat face 22 is Aformed with the flange 22EL for attachment to the flange 19 of the hinge molding and the face 23 is provided with the rear- Wardly extending hook-like keeper flange 27 having a keeper slot 28. uThis keeper slot may receive an edge of the interior lining .as shown in Figure 2, and hereinafter' referred to more in detail, or itmay cementitious insulating material.

receive' the flange 22 of a similar jamb molding 21a as illustrated in Figure 1l, and'A also hereinafter referred to more in detail. When the top, bottom and sides of the door frame- A are thus formed by the head and sill members 5 and the head and sill moldings 8 and 8a; the hinge or corner moldings 1Q; the jamb moldings 21, the meeting edges thereof are Welded to seal the joints and 'also maintain ,ai true angular frame.

It Will be apparent from thevforegoing description that the door frame A may be readily constructed from standardized p arts in a simple and expeditious manner, and when the frame is assembled in the manner described there is provided a continuous rectangular pocket for receiving the There# fore, the door frame constitutes a mold for the front part ofthc safe when the sides,

topand bottom are poured and remains an integral part thereof, thus materiallycon- .tributing to the lstability and strength of members 29 the front ends 30 of. which are -includes in its organization the base channel adapted to be secured to the bottom flange A 6a ofthe sill member 6 and also to the channel bar 1 While the rear ends 31 thereof pro- Vide a portion of the seat for receiving the slab constituting the back panel or `section C as will presently appear. `Also',\the fra-me includes the reinforced Slat-like ltruss niembers 32 and the upper corner angles 32" Whose front ends 33 are adapted to be Welded or' otherwise secured to the outer flanges of the side members 2 of the primary( structural element E. The upper truss member 32 and corner angles 32a arranged at the top of the frame .are secured to the upper flange 5 of the head member 5 at their front ends as Will be seen from Figures 3, 5 and 6 of the drawings, and thus in that respect are like the front ends 30 of the base channels 29 which engage with the flange 6a of the sill member 6. The rear ends 34 of the truss. members and upper corner angles are preferably inset as shown, and at a suitable distance back from the offset portion have secured thereto the angle members 35 which provide a solid abutment flange 36 against which the back section rests when it is angles 35 which provide a substantially continuous metallic abutment for the slab constituting the back section C when lthe latter is placed in position.

' iVhen the openmetallic skeleton o f the safe constituted by the door frame A and the cage B are completely `assembled the operation of pouring and molding the interior insulation unit or shell is performed with the lassistance of suitable removable molds. Thus, the cementitious insulating material constituting the sides F-F, top G and bottom G of the safe is then poured so that the cementitious material provides a continuous roundabout shell openat the back and front to receive the doors within the portion defined by the door frame and to also receive the back slab C. In the molding of the sides, top, and bottom walls the cementi tious m'aterial fills and surrounds the parts' constituting the door frame A thereby completely embedding the primary structural element E in the insulatng material because of the openings or spillways therein,`

and also filling the key openings in the head, sill, and jamb forming moldings 8--8n and 21 respectively to provide resistance to the conduction of heat.

lVhen the sides F-F and the top and bot# tom G-G are poured and molded, the rear edge thereof is formed with a continuous I stepped and mortised seat H Whose outer face includes the flanges 36 of the angles 35, thereby providing a continuous channel at the back edge of the molded structure for receiving the eomplementa'l tongueY and groove tenon portion H, of the slab which constitutes the back anel C; and, which,

as previously explained, is pre-cast or formed independently of the body of the safe and subsequently placed in position on the body so that the stepped portion H thereof will match with the seat H. To insure the adhesion of the back section to the bod 4a suitable fire resisting cement is placed in t e seat H thereby also sea-ling the joint ,formed between the back slab and-the body.

The back section G may obviously be formed in various different Ways but preferably includes a rectangular main Achannel member 37; the opposite vertical members of which are connectedby the cross truss member-'s 38 as shown in Figures 2', 3 and 4.`

As shown in Figure 6 of the drawings, the rear ends 31 of the base channels 29 and likewise the rear inset ends 34 of the straps or truss members 32 and corner angles 32 project beyond the roundabout angles 35, thereby to permit the back section to telescope within the same as it is fitted to its seat H on the body. The sides of the channel member 37 are exposed in the finished slab, thereby producing a metal to metal contact between the frame of the back panel and the projecting ends of the cage members and flange. 42 at the opposite edge. The inside portionof the sheets 40 adjacent the hinging edges thereof are preferably reinforced, as shown at 43. and the hinge leaves 14a are secured in position, as shown 1n Figures 1 and 2, to register with the hinge leaves 14 on the moldings 10. The stepped jamb-mating portion of each door is provided with a keeper flange 44 adapted to receive a similar portion .of an inner edge molding 44a which constitutes the portion of the door which registers and matches With the jamb molding'21 at the sides of the door` frame A. The recessed portions of the inner edge moldings 44 which receive the shouldered por-A tions or ribs of the jamb moldings 21 are provided with elongated openings 44b for permitting the cementitious material to project through the thickness of the metal and thereby provide additional resistance to heat which would be conducted by the middle of the door toward the interior or storage comi partment of the safe. The said inner ed e moldings 44a are preferably fitted wit angles`45 adapted to lengage with the rear sheets 46 of the doors to provide the interior face thereof, and the said sheets 46 are provided withv theinturned flanges 47 for receiving complem'ental fianges 48 of the angle members 49 which form a part of the joint edge of the door. The angles 49 in turn are connected with the edge portions of the stepped moldings 5() which moldings are standardized stock and, upon being reversed,

can be made to fit into each other when used on a right or left hand door.l In other words, the moldings 50 are of stepped formation and are adapted to nest one within the other to provide a tight joint at the meeting edges of the door and the alternate valleys resulting froml the step ed formation of these moldings are provi ed with elongated slots for receiving the cementitious material to further insure adequate heat resistance at the meeting edges of the doors. The top and bottom edges of the doors D are'formed by suitable moldings 50u-which are counterparts of the head molding 8 and sill molding 8, thus completing the doors.

After the vertical sides F-F and top and bottom-G-G are completed, the inte- Meegos rior insulating shellis fitted with an interior metallic lining which is assembled and fitted into the cavity formed by the united body and. back, and the exterior .is covered by a sheet metal casing. j

Referring first to the interior lining, which is assembled and then fitted into the body, itl will be observed from Figure 2 that the lining sheetV 5l covers the Ainner face of the back panel C and is provided at its opposite side edges with the relatively wide channel 52, While its top and bottom edges are formed with the keeper ila-n 'es rthatprovide keeper grooves for receiving the top and bottom liner plates 54 and 55 'whose front edges are respectively connected by suitable fastenings to the head molding 8, -as indicated at 56, and to the sill moldingSaL as indicated at 57. The wide, channels v52 are adaptedl to receive the angular ends 58 of the side sheets 59 whose front edges are provided with the reversely disposed angle flanges 60 which fit into the keeper grooves 28 of the jamb moldings. As will be observed from Figure 4, the top and bottom edges of the side sheets 59 are receive theinturned fianges 64 of the back sheet 65 which is slid into position to'thereby hold. the rear edges of the side sheets securely in place.' (See Figure 2.) The top and bottom edges of the side sheets 61 are provided with the inturned flange portions 6la and 61J vwhich are respectively fastened to the upper corner angles 32? and the base channel members 29. v

The cover 66 forJ the top wall G is preferably provided at its side edges with the overhanging bead-forming flanges' 67,` as will be observed from Figure 4, while the back edge thereof is provided with a dependingapron flange 68 which tlushly fits against the :rear outside sheet 65 and seals and protects the upper end of the back when placed in position. The front edge of the cover is provided with an overhanging bead-forming flange 69 which terminates in an inturned attaching flange 70 that is suitably` fastened to, the coupling strip 7, as shownj-in Figu v:

The bottom'masing member 71 is a duplica@ oi the 'rver 66, and as will be ob.-

served from Figures l and 3, the front bead or apron 7 2 thereof is attached t9 the coupling strip 7a forming a `part of the sill structure of the doorway,` while the side flanges 73 engage with the lower edges of the outer side sheets 61, as shown'in Fig ure 4, and the back fiange 74 thereof is suitably fastened to the lower edge of the back sheet 65, the fastenings preferably engaging with the channel 37 as well as the. back sheet 65 to insure firm anchorage of the facing sheets to the assembled structure. The

same comment is true of the 'fastenings which connect the flange 68 of the top sec- Vtion 66 with the upper edge of the back sheet 65.

Another novel and distinctive feature of the' invention .is to provide a vented i jo'int or seam construction for the inter-,v

fitting parts of the outer shell which will permit of the escape of gases generated withinvthe shell or casing in eventthe safe 'is subjected to heat, thereby. obviating the possibility of. buckling or damage due to confining the gases generated vby heat yof fire. Thisv type of ,joint may be provided wherever the back or vside sections are united by a folded seam as'for example at the rear corners of the outside shell, one of lwhich is shown in Figure 12 of the drawingsand wherein it will be seen that the flange 63 is cut away, as indicated at 63, to provide'a vent or .passage to escape ofgases at the point :v dlrectly between thelange 64 and the main wall of the flange 63.'

Figure 9 of the drawings illu-strates themanner of attaching the caster or\ roller devices R for supporting the safe in a portable manner. These caster units are preferably arranged so that they may be fasermit the i tened to the bottom` channel members 29, v

thereby having a firm and solid anchorage and support for the swiveled rollers or casters which enable the safe to be easily transported ormoved about.

Figures l0 and 11 show a safe constructed in yaccordance with the invention wherein additional moldings are used .to widen the door frame and thereby increase the thickness of the walls of the safe. In'all essential particulars the construction shown in Figures 10 and 11 is the same a the construction shown in Figuresxl to 9, but it will i be ynoted that the amb molding 21'a is duplicated "in conjunction with the molding -21 thereby to prdvide additional ribs an grooves at the sides of the doorwa and to j also increase the thickness of the slde walls F. As shown in Figure 10 the back panel C" is also of increased thickness and like- .'wise the .doors D are thicker than the doors D. The top and. bottom walls of the safe are also made thicker, as illustrated at G in Figure 11, by utllzing wider moldings S,

the same having the grooves or valleys thereof provided with openings s for,permitting the plastic cementitious material to break up the continuity of .the metal and thereby reduce its conductivity to heat.

It will, of course, be understood that the loors D of the safe may be provided with :he knobs or operating handles K, and the usual type of locking means L may-also be employed.

From the foregoing it will be apparent that one of the primary distinctive features of the present invention is the formation of a hollow body open at both sides and provided at one sidel with a door frame for receiving swinging hinged doors and provided at the opposite side with a seat for the back panel or slab which is fitted thereto and sealed in place. It Awill of course be understood that the back slab `does not depend upon the sealing material for uniting and holding the back section to the body of the safe, because the skeleton metallic frame or cage, about which the main body is built, provides for also telescopically receiving the metallic frame of the back panel thereby to permit the frame or cage and the backl to oe rigidly united or secured together.

Also a further distinctive feature of the invention yresides in the structural features and characteristics of the door frame A which constitutes a part of the mold for the front edges of the side walls of the safe.

As shown in Figures 2, 3, 4 and 10 of the drawings, suitable metallic reinforcement such as expanded metal .fr may be embedded .in the sides, top, bottom and back of the reproof composition while the saine is being molded to give added strength and reinforcement to the fireproof body. Furthermore, the valleys of the door joint may be filled with strip asbestos 1/ to prevent heat from penetrating through the joint.

Without further description it is thought that the features and advantages of the invention will be readilyk apparent to those skilled in the art and it will, of course, be.

understood that changes in the. form, proportion and minor details of construction may be resorted to without departing from the spirit of the invention or scope of the appended claims.

I claim 1. A fire-proof safe construction including a monolithic cementitious body unit provided With afront door-opening and with a rear opening surrounded by a joint forming seat, and a separate back panel consisting of a monolithic cementitious -unit provided at its inside edge portions with a joint forming seat permanently cemented to i said joint forming scat of the body unit.

2. A tire-proof safe construct-ion includmg a monolithic cementitious body unit having metallic members therein and provided with front and rear openings and a separate monolithic cementitious back panel arranged to cover and seal the'back opening of the body unit and having embedded metallic members joined to the metallic members of the body unit.

3. A fire-proof safe construction including a continuousmetal door frame, a monolithic cen'ientitious body unit cast on to said door frame and provided with a front door opening and with a rear opening surrounded by a joint forming seat and a separate precast back panel consisting of a monolithic ccmentitious unit having its edge portion permanently cemented to the'joint forming seat of the body unit.

4. A fire proof safe construction includingv a metal facing constituting the door frame and of a width corresponding to the wall thickness of the safe, reinforcing elements connected with and project-ing rearwardly from the door frame, and a wall forming insulation unit molded about the said reinforcing elements and in and-against the door frame.

5. A tire-proof safe construction including a metal door frame', bar-like wall reinforcing elemcntsarranged in spaced relation to form a cage connected with the door frame. and an interior insulation unit molded about the cage and in and against the door frame.

6. A tire-proof safe construction including a sheet metal door frame having openings for receiving and exposing insulation at the face of the door frame, and an interior insulationv unit molded in and on to the door frame whereby the insulation fills said openings to retard conduction of heat.

7. A tire-proof safe construction including a stepped door frame having insulation receiving and exposing openings arranged in the valleys thereofand an interior insulation unit molded in and on to the door frame whereby the insulation will key into said openings and retard the conduction of heat.

8. A tire-proof safe construction including a metallic door frame comprising a primary structural element, door frame forming moldings carried thereby, and a skeleton cage united to said primary structural elcme'nt and consisting of a plurality of truss members. and an interior insulation unit molded about said cage and against the said door frame.

9. A fire-proof safe construction including a door frame comprising an interior rectangular primary structural element having openings, door frame forming moldings secured to the said primary reinforcing clements and projecting beyond the same to provide a pocket between the structural element and the front of the safe, a` reinforclli;

lill

ing cage united with the primary structural element and an interior insulation unit molded about the said reinforcing cage and against the door frame and extending through the openings in the primary structural lsame and the door frame.

fire-proof safe construction including a metallic door frame comprising a primary structural element of rectangular formation and channel cross section, the web of the channel being provided with openings, door frame forming moldings secured to the said primary reinforcing element and projecting beyond the same to provide a pocket between the structural element and the front of the safe, a reinforcing cage united with the primary structural element and an interior insulation unit molded about the said reinforcing cage and against the door frame and extending through the open'- ings in the primary structural element to fill the pocket between the same and thei door frame.

11. A tire-proof safe construetion'including a jacketed metal casing having a frame structure provided with a hollow molding, and a member having openings providing communication between the jacket space of the casing and the space inside of the hollow molding, and a plastic material molded into the spaceof the jacket and through said openings into the space within said molding.

12. A fire-proof safe construction including a jacketed metal casing having a frame structure provided with hollow moldings surrounding the same, and a member having spillways providing communication between the jacketed space of the casing and the space inside of the hollow moldings, and a plastic material molded into the space of the jacket and through said spillways into the spare within-said molding. f

13. A fire-proof safe construction including a door frame. reinforcing elements connected with the door frame, an interior in sulation shelll molded to the 4door -frame and said reinforcing elements, a separate .back member consisting of .f an insulation panel formingthe back closure for the shell.l and a metal frame embedded in the back member and connected with the reinforcing elements. V

14%.l A tire-proof safe 4construction including a metallic door frame comprising a primary structural element, door frame forming moldings secured to said primary structural element, a reinforcing cage' also united to said primary structural element including bottom channel members, upper corner angles and intermediate slat-like truss members, abutment angle stripssecured crosswi'seto .the truss members, corner anglesand base' channels and s'paced from the rearA element to till the pocket between the ends thereof, an interior insulation unit molded about said cage and forming the top, bottom and sides of the interior shell of the safe, said interior shell haring a scat at the back edge thereof, a back panel adapted to lit in said seat, and means for means for connecting the portionV of the' cage projecting beyond the abutment elements to the back unit.

16. A fire-proof safe construction including a door frame, 'a skeleton cage connected with the door frame, an interior insulation shell molded to the cage and door frame, and a separate back member including a metallic frame adapted to be welded to the cage.

17. A fire-proof safe construction includinga door frame, a reinforcing cage connected with the' door frame, an interior insulation `shell molded to the frame and said cage, a separate back member for the shell and for the cage, and outside casing plates for the shell and back.

18. A. lire-proof safe construction ineluding a door frame, a reinforcing cage con.

neeted with the door frame, an interior insulation shell molded to the frame and cage, a separate back member for the shell and cage, louter side-casing plates interlocking at their front edges with the door frame and having out-turned grooves at their back edges, a rear casing plate interlocking with and holding the side-casing plates at their .real-ledges, and cover and base casing plates for the top and bottom of the safe.

19. A fire-proof safe construction including a door frame, a reinforcing cage con- *nected with the door frame, an interiorjinsulation shell molded to the frame and cage,

aseparate back member for the shell and the cage, and an interior box-like lining fitted into the hollow interior insnlation'shell and secured to the door frame.

. 20. A re-proof safev construction including a door frame, a reinforcing cage connected with the door frame, an interior insulation shell molded to the frame and cage, a-separate back member for the shell and ilo the cage, outer side-casing plates, and an interior box-like lining adapted to fit within the interior vinsulation shell, and' means for attaching the front edge of said lining to the inner edge ot the door frame.

2l. A fire-prooi sate construction including a metal door frame, a skeleton cage connected at its front end to the door` frame, an interior insulation unit molded on to said cage and in and on to the door frame, said insulation unit being formed atits rear side with a seat, a back panel adapted to fit in said seat, and means for connecting the panel to the said seat and cage.

22. A fire-prooi' safe construct-ion including an outer casing, an ihner casing, an insulation unit between the two casings, and a door frame consisting of head and 'sill moldings, side hinge moldings, and jamb moldings interposed between the hinge molding and the inner casing and consisting of standardized part-s separably binterlocked to vary the width of said j amb molding to determine the wall thickness.

23. A fire-proof safe construction including an outer casing, an inner casing, an insulation unit between the two casings, and a door frame consisting of head and sill moldings, hinge moldings, and jamb moldings interposed between the hinge molding and the inner casing, said moldings being standardized parts separably interlocking to vary the width of said inner molding to determine the wall thickness of the insulation unit, and said parts of the door frame being welded together at the corners to form a square frame.

24. A re-proof safe construction including an outer casing, an inner casing, an insulation unit between the two casings, and a door frame consisting of grooved head and sill moldings, hollow hinge moldings, and grooved jamb moldings interposed between the hollow hinge moldings and the .inner casing, said jamb moldings being standardized parts.

25. A fire-proof safe construction including an outer casing, an inner casing, an interior insulation unit between the two casings, and a door frame consisting of grooved' and slotted head and sill moldings, side' door frame having .locking grooves at its outer side edges, outer side-casing plates interlocking wlth said grooves, the rear edges of said outer sde-caslng plates being provided with flanges forming out-turned grooves, said flanges being cut away to provide vent passages, and a back casing plate having means at its side edges for interlocking with the flanges of the outer side plates.

v28. Adoor for fire-proof safes consisting of inner and outer casing plates and grooved and slotted door frame forming side-forniing moldings, and a cementitiou's insulating material filling the space between the said casing plates and the side-forming moldings and also keying in t-he slotted portions of the moldings. y '29. A fire-proof safe construction includ-r ing a hollow interior insulation shell open at both sides thereof, a metallic door frame arranged at one of the open sides thereof and a back panelI receiving seat formed at the other open side thereof, a back panel adapted to fit into said seat, and plastic means for permanently sealing and bonding the back to the shell.

30. A fire-proof safe construction including a hollow interior insulation shell open at opposite sides, a metallic door frame arranged at on side of the shell and the op posite side thereof having a mortised seat and a back panel having a tenon portion 'for fitting into said mortised seat, means iior sealing the joint between the hack and the body,\and reinforcing means connecting the door frame and the back section.

' 3l. A fire-proof safe construction includ- -ing a skeleton cage open at the front and the back, door frame forming moldings carried by the front of the cage, a fire-prooi cementitious composition molded about said frame and flowed into -the said door framey and forming an interior shell, and the rear edge of said cementitious shell being Jformed with a mortised seat, side members of the cage projecting beyond the seat, a back. panel having metallic reiniorcement therein and provided witha tenon part for fitting into said mortised seat of the body, and means for fastening/the projecting ends of-the frame members to the metallic reintorcement of the back-panel.

32. A fire-proof safe construction including outer or inner casing members, and extensible moldings adapted to be located between the inner and outer casing at the ,front of the safe to vary the distance be tween thecasing members according to the wall thickness desired, and insulation between the said casing members.

33. A fire proof safe construction including a skeleton reinforcing cage for the top, bottom and sides of the safe consisting of a plurality of spaced structural steel members arranged and distributed to provide a trussed reinforcing framework, and an 1n sulation unit molded on and about said cage 34;. A fire proof safe construction includ ing a skeleton cage consisting of vertical liti , and on to said framework and formed with a seat at its rear edge, and a back panel also of cementitio'us insulating material and having therein a reinforcing frame, means ifor connecting the frame of the back panell with said framework and means for sealing the joint between the backpanel and the seat of the insulating unit.

36. A fire-proof safe construction including an insulated safe body having bar-like metallic reinforcing members embedded therein and projecting from an edge thereof, a separate back panel, and means for connecting the back panel with the projecting ends of said bar-like reinforcing members.

37. A fire-proof safe construction including an insulated safe body having a depressed seat and bar-like metallic reinforcing members embedded therein and `projecting beyond said seat, a separate back panel-including a metallic reinforcing frame, said metallic reinforcing frame ofthe back panel being adapted to be Welded to the projecting reinforcing members of the body.

38. A re proof safe construction including an insulated safe body, a metallic door frame, side Wall casing sheets interlocked with the sides of said metallic door frame, a back casing sheet interlockin with said side casing sheets, and cover and ase end plates for fitting over the ends of the side, back, and casin sheets and also the door frame.

39. A re-proof safe'constructioii including a cementitious body and a metal door frame provided in the joint faces thereof with a plurality of openings receiving plugs the cross' sectional area of the surrounding at the door joint.

`of' the cementitious body and also reducing metal thereby to minimize heat conduction 40. A fire-proof safe construction including a metallic door frame having a plurality of series of openings in the' joint faces thereof, the openings of one series being arranged out of registery with the openings of the other, thereby to reduce the cross sectional area of the metal and consequently reduce the heat conductivity of the metal aty the door joint.

41. A fire-proof safe construction including a `metallic door frame having a plurality of series of openings in the joint faces thereof, the openings of one series being arranged out of registry with the openings of the other, thereby to reduce the cross sectional area of the metal and consequently reduce the heat conductivity thereof, andinsulating material filling said openings to the depth of the metal.

42. A fire-proof safe construction including"a cementitious body and a sheet metal outside casing for said body consisting of a plurality of plates formed with interlocking anges arranged t provide a gas outlet for the space confined by said plates.

In testimony whereof I hereunto aix mysignature in the presence'of two witnesses.

y FRED A. SCHMITZ# itnesses W. C. Comuna., Dorofrmr FITCH. 

